Testing rack



FIG. 1 is a top perspective view of a testing rack, showing my newdesign.

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a left plan view thereof.

FIG. 4 is a right plan view thereof.

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a front elevation view thereof.

The broken lines and unshaded areas enclosed by the broken lines depictportions of the testing rack that form no part of the claimed design.

The ornamental design for a testing rack, as shown and described.